Method and device for testing sound insulation performance of flat plate

Abstract

The embodiment of the invention discloses a flat plate sound insulation performance testing method and device, and the method comprises the steps: obtaining the sound pressure level in a reverberation chamber and the sound intensity level of an anechoic chamber side through starting a sound source generator disposed in the reverberation chamber in a testing state, and determining a first sound insulation index according to the sound pressure level and the sound intensity level in the testing state; and obtaining a second sound reduction index, and determining the sound reduction index of the to-be-detected flat plate according to the first sound reduction index and the second sound reduction index. Wherein the second sound reduction index is determined according to the sound pressure level and the sound intensity level in the through hole state after the sound source generator is started in the through hole state. The test method in the through hole state is designed for the test process of the sound insulation performance of the flat plate, test result errors caused by a sound insulation test tool are eliminated, and the accuracy of the sound insulation performance test result of the flat plate is improved.

Description

technical field [0001] This application relates to the field of acoustic testing, in particular to a method and device for testing the sound insulation performance of a flat panel. Background technique [0002] Vehicle NVH (Noise, Vibration and Harshness, noise, vibration and harshness) performance is an important index to evaluate the performance of the vehicle, among which, the sound insulation performance of the vehicle is the most easily perceived and complained by the user. One of the NVH performances of vehicles, the sound insulation performance has an important impact on user reputation and brand image. [0003] In the development of NVH of the whole vehicle, it is necessary to measure the sound insulation of the flat sample used for sound insulation as the input of the NVH simulation of the whole vehicle. In the existing method for testing the sound insulation performance of flat panel samples, the flat panel sample to be tested is usually placed on the sound insula...

AI Technical Summary

Problems solved by technology

In the actual test process, because the sound insulation test tool has a through hole where the flat sample to be tested is installed, the sound wave in the reverberation chamber encounters a cross-sectional change during the propagation process, and the acoustic impedance does not match, resulting in sound wave reflection, that is, in the In the process of sound insulation performance testing, there are unavoidable structural sound insulation errors caused by sound wave reflection

Therefore, the existing test results of the sound insulation performance of the flat panel sample are not the real sound insulation of the flat panel sample to be tested. When it is used as the vehicle NVH simulation input or the performance evaluation basis for the flat panel sample, there are serious deviations. Affect subsequent development and use

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